You get the VIP pack with the limited edition which includes some custom tuned cars, special VIP only multiplayer events, decals, a steel book case, $10 worth of in game tokens, some in game badge, double speed stat boosting.
The following cars are included in the VIP pack.
1965 Shelby Cobra 427 S/C
1987 RUF CTR Yellowbird
1991 Mazda #55 787B
2011Ford F150 SVT Raptor
2011Bugatti Veyron Super Sport
The limited edition car pack comes with these.
2011 Audi RS 3 Sportback
2012 Aston Martin Vanquish
2013 Ford M Shelby Mustang GT500
2011 Maclaren P1
2013 SRT Viper GTS
Every edition even the standard day one edition comes with these.
2010 Audi TT RS Coupe
2013 Ford Focus ST
2011 Lamborghini Gallardo LP570-4 Superleggera
So for fans of the game and people who want to fast track the online races, the limited edition may be worth it. Especially considering that $10 of in game tokens can probably buy you and allow you to upgrade a few cars, sell the limited edition cars back in the game if they aren't your thing and have quick cash.